40.5 MB (3.7 MB compressed)
3758 x 3765 pixels
31.8 x 32.0 cm ⏐ 12.5 x 12.6 in (300dpi)
CC STUDIO / SCIENCE PHOTO LIBRARY CC STUDIO / SCIENCE PHOTO LIBRARY
Optometry equipment used in the late nineteenth and early twentieth centuries. The case holds numerous lenses which the optometrist would place in the empty spectacle frame to determine the focal length of the lenses needed in a patient's glasses.
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